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Bentonite  is an absorbent clay consisting mostly of 70% montmorillonite.

Montmorillonite is a porous clay mineral composed of layered structure with exchangeable cations between the layers.

The montmorillonite minerals are products of volcanism and hydrothermal activity and are composed of hydrous aluminum silicates in the form of extremely small particles. They take up water between their layers, causing swelling, and change the interlayer spacing according to the mineral variety.

Thus, it can be applied where its colloidal properties can be exploited. Bentonite has a wide variety of uses including foundry, animal feed, drilling mud, absorbent, industrial, and specialty uses.

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